Metallic coating for metallic articles.



l E. J. LOHMANN. y METALLIC GOATNG FOR METALLIC ARTICLES.

'APPLlGATIOH FILED PEB.20, 1912.

CID

e'. :cci-immer, ce New JERSEY, science :se sacememi ccimemf, ce Newcome, e; Y., A ccimeceemmi ce? New wim.

To all 'whom 'z' 712.6414/ 00:46am:

Ee it known thai; l, HERMAN J. Lon- MANN, a, citizen of tlie UnitedStel-ee, 'Ie- Sidiiig et 30 Monticello avenue, Jersey Cilly, county of Euscn, and State of New 'esey, lieve iiiveiiied ceriein new and usefulproveniente in Metallic Coetiiw for laici-ailic ti'cles, fully describedamil: represented in the folle ing specification and the accompanyingdra-wings, forming c per?. of the same. v

The present invention relates to c means for preventing the corrosion of'metallic-azfcicles, especially `'chose made of iion cr steel,

emlsuch means consists o a lead ccaing permeaiiiig the subsi-ence c" theci'icle to e measurable cleplifan lie-ving e strong chemical uniontherewith, so es to prevent "che peiietraticn of die atmosphere and `@heiesultant cxiclatic-n cf 'Lilie article The mesi; common meane useii forproeecizing ii'on and seel articles is tile recess of co-csilieclgalvanizing with zinc; bui- 'lze susceptibility of zinc to emission byeimcspiiei-ic influences, amil especially by sului'ous ci sulfuric acid.fumes and vaipci'e, enel by see-ei? ci' see-Water, is well known. Zincis e brittle metal, which poc-eesses ciily e Surface adiiesicn with thecle, and sliceL-inefaiI coac Wixtli it caniic' therefore be wcilied imcforms where 'lie meiai is ebiiigly eiitf, Withcuciecliing coming emiexposing ilse sliee te exif alien. I

The present' iii/vcnicii sulis-ituiee :i coeting cf lead alone cr with eslight admixture of tim for the zinc coating heretofore used. l; is wellknown that lead pzieeents e. greci resistencctc suluz'cus end cilieiccriosive La; l'

fumes, and that i'is entirely flexible, sc

that sheet-metall, articles.' combed lieeiiiiii may be bentWithoutciecliing the coating; but. leed alcne'has not usually beenlcelesti uicfl for zinc es a coating, because il has :uc iliiniiy foy icnand 'the means emplcyezi ier eimclii xg "alie zinc coating will not Leche mi sewing saiiscccrily;

if have iliscc'veieii time vlie pccess ici' coming iron ci' steelcrticlee petcicd te me cn pi'ii 25,;1911, 'in Patent- -lc. 99%?442-3,een lee usecl tc coat eiticles fr? iron. ci', steel willi .e plein vleed@eating which oimc a chemical union with the surface ci.' he

Y article and Apenetrates ille same so es to protec-t it, even if theSurface coating be le moveal cy Wee? or ebieeion. This fliscov, er 4 1sgreet velue, iiecauee lead is materi-a al y cheaper than zinc, articlescan therefore he coated wiili ic et less cost, L1nd pcssess e resistance'lo corrosion which is nien? imes giee'tei ilien *vliet afforded by:amcb Wiei'e e briglitappecience is flesiijedrin the aiticle, I mix oneper cci. tin Willi tlie leacl, such addition als@ cusing the lead toflow mere freely when ,applied L0 the'. metallic articles emi giviiw'liie coating a little brighter ccloi, while it fem-eins substantially alecci-scalino. I

The article claimed. herein is readily distinguished fiom any platesheretofore coated. Wiisl lead, by lie peiietieiicpc" the coatingiiitcthe eiiics'izmce ci the licle .and iis chemical unici; iiexewith. le' isalso dialinguisliecl ieiii' any leed-cceed ci zinc-coal-ed articleetci'ore produc-Qi, iw ille abeciice cf any l .1, of {icmmcziiicnetiieezi ille coal;- mg e2 the eiicle when e .tien ci the aiticie ieiclieil mici exiiliiin scope. i L' tf. i

`the s lied of e re-cteiiguliai' piece ci" mi ffii i 235 the coatingapplied u icii Sies, cxc-ep- Whe'e ii been re :il from lli-e surface effche iicn upm e i-ticii cf iis unclei: le.. F shows rciiglit mailccnsideiei'ly enlcged wich ille end. poticii in 9D section.

lullig. l, e elicws the substance ofthe recuaiguler caemg, 73 shows: thecoating there-eli, c the pcrmcn ci the coming which penetrates theeupeilciiil ciyslals ci the 9o casbizig, which genetischen. isgfcplcelly shown by .Siipplmg upcn such cryscie. (l

.designates the sui-face cf 'the cesing wliei'c' pcice cf die upenlieluider faille; 1 ich euicce "'hcwin mctecislie es ne coating is remo@iii 2, e. neil Q15 Swede iicn simi-z fille leiei' c designates thelibe-mis bully ci' tlieneillie letter lie usibleineiil ce ling, ami cheletter c lice permcaiiig gicii' of the ccaiiing which exiemls inte andbc'ween h ying; ille ccniig tc the celle-le, ille iw lead alone, oradmixed with one per cent. of tin is melted to form a molten bath, andthe article. dipped therein after suitable preparation to cause apenetration of the melted metal into the substance of the ar- "ticle anda chemical union therewith.

At the present time, l use the process clescribed in the said Patent No.990,443, for amalgamating the surface of the article in a peculiarmanner before dippingit into the bath of the molten metal; but my claimherein is not to the method oii coating, but to the article having` thecharacteristics claimed, however they may be obtained. Thesecharacteristics give the lead-coated metallic article an extraordinaryresistance to corrosive agents, so that articles `with Such a coatingare able to resist sea-Water, the corrosive atmosphere in mines and acidtatories, chimney stacks, and other situations Where ordinary galvanizedarticles'are soon corroded.

lThe present invention is a specific form of that claimed in Inapplication No. 585,952 filed October 8, 1910 for patent on pernieatingprotective for iron and steel articles, in which claim is made broadlyto an anticleor" iron or steel having acoatingof any metal of the leadgroup (lead, zinc or tin) covering its surface and penetrating thesubstance of the article to a material and measurable depth and forminga chemical union therewith, and my present application is thereforelimited to the Specific forni of the invention described and claimedherein.

Having thus set forth the nature of my invention what is claimed hereinis:

l. A metallic article having a coating chiefly of lead disposed upon thesurface and penetrating into the substance oi the article to a materialand measurable depth and forming a chemical union therewith, suchperineating portion of the lead operating` to protect the article fromcorrosion in dependently of the surface-coating.

2. Ari article or iron or steel having a coating,- chiefly of leeddisposed 'upon the surface, the lead having about one per cent. of tinmingled therewith, and the coating having a penetration into the exposedpores of the article to a material and measurable depth and forming achemical union with the exposed surfaces, such permeating portion of thecoating-metal operating to protect the article from corrosionindependently of the surface-coating.

In testimony' whereof l have hereunto set my hand in the presence oi'two subscribing Witnesses.

HERMAN J. LOHMf'kllN.

Witnesses JOHN Gr. HELDEN, THOMAS S. CRANE.

Cir

